CN109670368B - Biological characteristic image acquisition system - Google Patents
Biological characteristic image acquisition system Download PDFInfo
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- CN109670368B CN109670368B CN201710951445.1A CN201710951445A CN109670368B CN 109670368 B CN109670368 B CN 109670368B CN 201710951445 A CN201710951445 A CN 201710951445A CN 109670368 B CN109670368 B CN 109670368B
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- display panel
- preset area
- biological characteristic
- infrared
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The invention belongs to the technical field of image acquisition and provides a biological characteristic image acquisition system, wherein a plurality of array sensor units (210) are arranged on a substrate (200), each array sensor unit (210) comprises a first preset area (211) and a second preset area (212), the first preset area (211) is used for enabling the light signal emitted by the display panel to penetrate through, the second preset area (212) is used for generating infrared light to the collected organism when the display panel is closed, and processes the reflected signal and generates a biological characteristic image, thereby being not limited by the display content of the light source of the display panel, the method can acquire the biological characteristic image even if the display panel is closed, thereby solving the problem that the application is limited because the light emitted by the display panel is required to be used as a signal source in the existing biological characteristic image acquisition technology, and the biological characteristic image can be acquired only when the display panel works.
Description
Technical Field
The invention belongs to the technical field of image acquisition, and particularly relates to a biological characteristic image acquisition system.
Background
Since 2013 introduction of fingerprint identification to IPhone5S of apple cell phone, a fingerprint identification technology is widely applied to intelligent equipment, and the technology is simple, fast and safe, so that hundreds of millions of people receive and rely on fingerprint identification as unlocking devices of intelligent equipment such as cell phones and tablets, and meanwhile, with the rise of mobile payment, the trouble of inputting passwords is saved for users by means of fingerprint identification instead of passwords. Today, fingerprint recognition modules have become standard configurations for smart phones.
Then, in order to meet the requirements of users on increasing the proportion of mobile phone screens and the requirements of full-screen fingerprint identification, the combination of fingerprint identification and display technology is a difficult problem for mobile phone developers. For example, the optical fingerprint technology and the ultrasonic fingerprint technology under the screen can only be applied to the OLED screen, the requirement on the screen is high, the application is limited, and the fingerprint identification area is fixed in a smaller range, which is far from the full-screen fingerprint technology.
The full-face screen patent owned by Apple company combines Micro-LED technology, and adds an infrared transmitting and receiving unit in a gap between the same layers of a display unit, but the technology has very high requirements on the processing technology of the display technology and the infrared transmitting and receiving unit. And the technology can only be used for Micro-LED screen technology and cannot be compatible with the existing LCD screen and OLED screen.
Fig. 1 illustrates a structure of an optical fingerprint acquisition device according to the prior art, in which a display panel 300 is used as a light source, a sensor 200 is disposed above the display panel 300, light emitted from the display panel 300 is used as a light signal source, and when a finger 500 is placed above a protective cover 400 for touching, the display panel 300 is required to provide a signal source for capturing a biometric image, so that the application of the optical fingerprint acquisition device is limited because the display panel 300 is particularly dependent on information displayed when the display panel 300 is in operation, and once a screen is closed or a user has a requirement for the displayed information, an effective biometric image cannot be obtained.
Therefore, the existing biometric image acquisition technology has the problem that the application is limited because the light emitted by the display panel is required to be used as a signal source, and the biometric image can be acquired only when the display panel works.
Disclosure of Invention
The invention aims to provide a biological characteristic image acquisition system, and aims to solve the problem that the application is limited because the biological characteristic image can be acquired only when a display panel works due to the fact that light rays emitted by the display panel are required to be used as a signal source in the conventional biological characteristic image acquisition technology.
The invention provides a biological characteristic image acquisition system, which comprises a substrate arranged on a display panel, wherein the substrate is provided with a plurality of array sensor units, and each array sensor unit comprises a first preset area and a second preset area;
the first preset area is used for enabling an optical signal emitted by the display panel to penetrate through, the second preset area is provided with an infrared emitting device, an image sensing device and a switch device, and the switch device is electrically connected with the infrared emitting device and the image sensing device;
the switching device is used for controlling whether the infrared emission device and the image sensing device work or not; the infrared emitting device is used for emitting infrared light to the collected organism and reflecting the infrared light when the display panel is closed, so that the corresponding image sensing device receives the infrared light and generates a biological characteristic image.
Preferably, the image sensing device performs signal amplification, filtering, and analog-to-digital conversion on the reflected infrared light to generate the biometric image.
Preferably, the infrared emitting device is in particular an infrared light emitting diode.
Preferably, the image sensing device includes a photodiode or a photo resistor.
Preferably, the switching device is embodied as a thin film transistor.
Preferably, the display panel includes an LCD panel, an OLED panel, a QLED panel, and a Micro LED panel.
To sum up, the above-mentioned biometric image acquisition system is characterized in that a plurality of array sensor units are disposed on a substrate, each array sensor unit includes a first preset region and a second preset region, the first preset region is used for allowing an optical signal emitted by a display panel to penetrate therethrough, the second preset region is used for generating infrared light to an acquired organism when the display panel is closed, and processing a reflected signal and generating a biometric image, so that the biometric image acquisition system is not limited by the display content of a light source of the display panel.
Drawings
Fig. 1 shows a schematic structural diagram of an optical fingerprint acquisition device related to the prior art.
Fig. 2 is a schematic structural diagram of a substrate in a biometric image capturing system according to the present invention.
Fig. 3 is a schematic structural diagram of an array sensor unit in a biometric image capturing system according to the present invention.
Fig. 4 is a circuit diagram illustrating an exemplary circuit diagram corresponding to a second predetermined area on a substrate in a biometric image capturing system according to the present invention.
Fig. 5 is a schematic diagram illustrating an application principle of a biometric image capturing system according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the biological characteristic image acquisition system provided by the embodiment of the invention, the plurality of array sensor units are arranged on the substrate, each array sensor unit comprises a first preset area and a second preset area, the first preset area is used for enabling an optical signal emitted by the display panel to penetrate through, and the second preset area is used for generating infrared light to an acquired organism when the display panel is closed, processing the reflected signal and generating a biological characteristic image.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 2 and fig. 3 respectively show specific structures of a substrate and an array sensor unit in a biometric image capturing system provided by the present invention, and for convenience of description, only parts related to embodiments of the present invention are shown, and detailed descriptions are as follows:
the biometric image acquisition system comprises a substrate 200 arranged on a display panel, wherein the substrate 200 is provided with a plurality of array sensor units 210, and each array sensor unit 210 comprises a first preset area 211 and a second preset area 212;
the first preset region 211 is used for allowing an optical signal emitted by the display panel to penetrate therethrough, and the second preset region 212 is provided with an infrared emitting device 215, an image sensing device 216 and a switching device 217, wherein the switching device is electrically connected with the infrared emitting device 215 and the image sensing device 216217;
the switching device 217 is used for controlling whether the infrared emitting device 215 and the image sensing device 216 operate or not; the infrared emitting device 215 is used for emitting infrared light to the collected living body and reflecting the infrared light when the display panel is closed, so that the corresponding image sensing device 216 receives the infrared light and generates a biological characteristic image.
As an embodiment of the present invention, the image sensor 216 amplifies, filters and performs analog-to-digital conversion on the reflected infrared light to generate the biometric image. The biological object may be a finger or palm of a human or other individual or object with biological characteristics.
As an embodiment of the present invention, the plurality of array sensor units 210 are arranged in an array, each array sensor unit 210 includes a first predetermined area 211 and a second predetermined area 212, the first predetermined area 211 is a transparent area and is configured to allow an optical signal emitted by the display panel to penetrate therethrough, and the second predetermined area 212 is an opaque area.
Fig. 4 shows an exemplary circuit corresponding to a second predetermined area on a substrate in a biometric image capturing system provided by the present invention, and for convenience of illustration, only the portion related to the embodiment of the present invention is shown, and the detailed description is as follows:
as an embodiment of the present invention, the infrared emitting device 215 is specifically an infrared light emitting diode D1.
The image sensor device 216 includes a photodiode or a photo resistor (fig. 4 is represented by a photodiode D2) as an embodiment of the present invention.
As an embodiment of the present invention, the switching device 217 is specifically a thin film transistor (represented by TFTs 1 and 2 in fig. 4), and the thin film transistor includes a-si (amorphous silicon), LTPS (low temperature polysilicon), IGZO (indium gallium zinc oxide), and the like.
As an embodiment of the present invention, the Display panel includes an LCD (Liquid Crystal Display) panel, an OLED (Organic Light-Emitting Display) panel, a QLED (Quantum Dot Light-Emitting Diodes, self-luminous) panel without an additional Light source, and a Micro LED (LED miniaturized and matrixed) panel.
As an embodiment of the present invention, the exemplary circuit corresponding to the second preset area 212 further includes a control unit 600, where the control unit 600 includes a signal generator 616, a signal amplifier 611, a filter 612, and a digital-to-analog converter 613; the output end of the signal generator 616 is connected to the first end of the first thin film transistor TFT1, the second end of the first thin film transistor TFT1 is connected to the anode of the infrared light emitting diode D1, the cathode of the infrared light emitting diode D1 is grounded, the first end of the second thin film transistor TFT2 is connected to the anode of the photodiode D2, the cathode of the photodiode D2 is grounded, the second end of the second thin film transistor TFT2 is connected to the input end of the signal amplifier 611, the output end of the signal amplifier 611 is connected to the input end of the filter 612, and the output end of the filter 612 is connected to the output end of the digital-to-analog converter 613.
The first thin film transistor TFT1 controls whether the infrared light emitting diode D1 operates, the second thin film transistor TFT2 controls whether the photodiode D2 operates, and the reflected signal received by the photodiode D2 is sequentially subjected to signal amplification by the signal amplifier 611, filtering by the filter 612, and digital-to-analog conversion by the digital-to-analog converter 613 to generate a biometric image.
Fig. 5 illustrates an application principle of a biometric image capturing system provided by the present invention, and for convenience of explanation, only the parts related to the embodiment of the present invention are shown, and detailed description is as follows:
a biological characteristic image acquisition system comprises an LCD (liquid crystal display) panel, which is provided with a backlight module 900, a liquid crystal module 800, a substrate 200, an infrared optical filter 300 and a cover plate 400.
According to the application scene of the mobile phone, the biological recognition function can be used under the conditions of screen turn-off and screen turn-on. If the display panel of the mobile phone is closed, the substrate 200 emits infrared light with a wavelength invisible to human eyes, so that the display panel is still in a screen-off state for a user, and the screen-off unlocking action is completed after a reflection signal is detected, a biological image is acquired, and matching and comparison are successful;
when the screen is turned on and the unlocking request is required, the visible light emitted from the display panel passes through the first preset region 211 of the substrate 200 and then passes through the transparent cover 400, so that the displayed content is visible. While the infrared emitting device 215 of the second predetermined area 212 emits an infrared signal source, which has no influence on normal display visible to human eyes, and the image sensing device 216 receives the reflected signal.
The filter 300 in fig. 5 is used to block the emission of visible light emitted from the display panel and the entrance of external visible light into the image sensing device 216.
Therefore, the above biometric image capture system has advantages particularly in that:
(1) the Thin Film Transistor (TFT) switching technology is adopted to replace the current silicon-based technology, so that the defect that a silicon wafer is not light-tight is overcome, and the characteristics that the silicon wafer is high in cost and is not beneficial to manufacturing an optical sensor with the size of a mobile phone screen are overcome; by utilizing the technology, a scheme with low cost for identifying the large-area or full-screen biological image becomes feasible;
(2) the design of integrating transmitting and receiving optics is adopted, the requirement on the display content of the display panel is avoided, the display panel can be applied to the scene of closing the display panel, the display panel is suitable for the working scene of the application end of the mobile phone, and the application limitation is avoided;
(3) the invention has no requirement on the display technology, can be applied to the display technologies such as LCD, OLED, QLED and Micro-LED, does not need to modify the structure of the existing display technology, reduces the technical and process difficulties and is beneficial to rapid industrialization;
(4) the display and the optical transmitting and receiving are not required to be integrated, the mode is more flexible, the manufacture is simple, the processing yield is high, and the display device can be matched with other display devices and can be independently used as a biological image sensor.
The operation principle of the above biometric image capturing system is described below with reference to fig. 2 to 5 as follows:
when the display panel works normally, the light transmitted by the display panel can be used as a light source;
when the display panel is turned off, the infrared emitting device 215 emits infrared invisible light, which is irradiated onto a collected living body, such as a finger or a palm of a human body, and is partially reflected by the surface layer of the finger 500 or the palm of the human body, and partially enters a vein blood vessel inside the surface layer to be reflected, and the image sensing device 216 receives a reflected optical signal, and the electrical characteristic thereof changes, such as the photodiode type image sensing device 216, which exhibits a characteristic that the current is significantly increased. The switching device 217 is used as an on-select switch and a signal output switch of the image sensing device 216, and selects to turn on the image sensing device 216 in a specific area, form a path and connect a signal to the signal wire, which is connected to the control unit 600, and the signal amplifier 611 amplifies the signal, the filter 612 filters the signal, and the digital-to-analog converter 613 quantizes the signal to generate an effective biometric image. When used for biometric recognition, the image information quantized by the dac 613 needs to be algorithmically compared with the information previously recorded and stored to determine whether there is a match.
In summary, the embodiments of the present invention provide a biometric image capturing system, in which a plurality of array sensor units are disposed on a substrate, each array sensor unit includes a first predetermined area and a second predetermined area, the first preset area is used for enabling the light signal emitted by the display panel to penetrate through, the second preset area is used for generating infrared light to the collected organism when the display panel is closed, and processes the reflected signal and generates a biological characteristic image, thereby being not limited by the display content of the light source of the display panel, the method can acquire the biological characteristic image even if the display panel is closed, thereby solving the problem that the application is limited because the light emitted by the display panel is required to be used as a signal source in the existing biological characteristic image acquisition technology, and the biological characteristic image can be acquired only when the display panel works. The embodiment of the invention is simple to realize, does not need to add extra hardware, can effectively reduce the cost and has stronger usability and practicability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A biological characteristic image acquisition system comprises a substrate arranged on a display panel, and is characterized in that the substrate is provided with a plurality of array sensor units, and each array sensor unit comprises a first preset area and a second preset area;
the first preset area is used for enabling an optical signal emitted by the display panel to penetrate through, the second preset area is provided with an infrared emitting device, an image sensing device and a switch device, and the switch device is electrically connected with the infrared emitting device and the image sensing device; the first preset area is a transparent area, and the second preset area is an opaque area;
the switching device is used for controlling whether the infrared emission device and the image sensing device work or not; the infrared emitting device is used for emitting infrared light to the collected organism and reflecting the infrared light when the display panel is closed, so that the corresponding image sensing device receives the infrared light and generates a biological characteristic image.
2. The biometric image acquisition system of claim 1 wherein the image sensing device performs signal amplification, filtering, and analog-to-digital conversion of the reflected infrared light to generate the biometric image.
3. The biometric image capture system of claim 1, wherein the infrared emitting device is specifically an infrared light emitting diode.
4. The biometric image capture system of claim 1, wherein the image sensing device comprises a photodiode or a photoresistor.
5. The biometric image capture system of claim 1, wherein the switching device is embodied as a thin film transistor.
6. The biometric image capture system of claim 1, wherein the display panel comprises an LCD panel, an OLED panel, a QLED panel, and a micro led panel.
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